Alert archive / Georgia / Mesoscale Discussions in 2012
Mesoscale Discussion 1754
The Storm Prediction Center issued this mesoscale discussion at Aug 13, 2012, 3:49 PM CDT for Cleburne County, Alabama; 13 counties in Georgia; 7 counties in Tennessee. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Aug 13, 2012, 3:49 PM CDT (20:49 UTC)
- Expired
- Aug 13, 2012, 4:45 PM CDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 21 counties
Cleburne County, AL, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Douglas County, GA, Floyd County, GA, Gordon County, GA, Haralson County, GA, Murray County, GA, Paulding County, GA, Polk County, GA, Walker County, GA, Whitfield County, GA, Bledsoe County, TN, Bradley County, TN, Hamilton County, TN, Marion County, TN, Meigs County, TN, Rhea County, TN, Sequatchie County, TN
The radar
The Northeast Alabama radar (KHTX), 85 km from the middle of the area, began a volume at 20:49 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 8.8 hours before the alert went out and 210 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1430 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 12:21 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 22 more | 24 min |
| Aug 13, 12:38 PM CDT | Severe Thunderstorm Watch | SPC | Bibb, Blount, Calhoun, Cherokee, Chilton, Choctaw and 21 more | 4 hr |
| Aug 13, 3:15 PM CDT | Mesoscale Discussion | SPC | Carroll, Crockett, Dyer, Fayette, Gibson, Hardeman and 9 more | 30 min |
| Aug 13, 3:32 PM CDT | Severe Thunderstorm Watch | SPC | Carroll, Chester, Crockett, Dyer, Fayette, Gibson and 12 more | 7 hr |
| Aug 13, 5:14 PM CDT | Mesoscale Discussion | SPC | Fayette | 91 min |
Nearby
Mesoscale Discussions in Georgia, 2012Mesoscale Discussions in Tennessee, 2012Mesoscale Discussions in Alabama, 2012Every mesoscale discussion in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.